Skip Oversized Email Attachments
Removes attachments that would make an email larger than your mail server accepts and notes it in the message, so the email still arrives instead of bouncing.
Snippet Library
Email snippets for WordPress
Snippets for the emails WordPress sends: change the sender name and address, add a Reply-To header, send HTML email and turn off notifications you do not need. For site owners who want their messages to arrive and look right.